/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % W W BBBB M M PPPP % % W W B B MM MM P P % % W W W BBBB M M M PPPP % % WW WW B B M M P % % W W BBBB M M P % % % % % % Read/Write Wireless Bitmap (level 0) Image Format % % % % Software Design % % Cristy % % January 2000 % % % % % % Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization % % dedicated to making software imaging solutions freely available. % % % % You may not use this file except in compliance with the License. You may % % obtain a copy of the License at % % % % https://imagemagick.org/script/license.php % % % % Unless required by applicable law or agreed to in writing, software % % distributed under the License is distributed on an "AS IS" BASIS, % % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % % See the License for the specific language governing permissions and % % limitations under the License. % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % */ /* Include declarations. */ #include "MagickCore/studio.h" #include "MagickCore/attribute.h" #include "MagickCore/blob.h" #include "MagickCore/blob-private.h" #include "MagickCore/cache.h" #include "MagickCore/color-private.h" #include "MagickCore/colormap.h" #include "MagickCore/colorspace.h" #include "MagickCore/colorspace-private.h" #include "MagickCore/exception.h" #include "MagickCore/exception-private.h" #include "MagickCore/image.h" #include "MagickCore/image-private.h" #include "MagickCore/list.h" #include "MagickCore/magick.h" #include "MagickCore/memory_.h" #include "MagickCore/monitor.h" #include "MagickCore/monitor-private.h" #include "MagickCore/pixel-accessor.h" #include "MagickCore/quantum-private.h" #include "MagickCore/static.h" #include "MagickCore/string_.h" #include "MagickCore/module.h" /* Forward declarations. */ static MagickBooleanType WriteWBMPImage(const ImageInfo *,Image *,ExceptionInfo *); /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e a d W B M P I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ReadWBMPImage() reads a WBMP (level 0) image file and returns it. It % allocates the memory necessary for the new Image structure and returns a % pointer to the new image. % % ReadWBMPImage was contributed by Milan Votava . % % The format of the ReadWBMPImage method is: % % Image *ReadWBMPImage(const ImageInfo *image_info, % ExceptionInfo *exception) % % A description of each parameter follows: % % o image_info: the image info. % % o exception: return any errors or warnings in this structure. % */ static MagickBooleanType WBMPReadInteger(Image *image,size_t *value) { int byte; *value=0; do { byte=ReadBlobByte(image); if (byte == EOF) return(MagickFalse); *value<<=7; *value|=(unsigned int) (byte & 0x7f); } while (byte & 0x80); return(MagickTrue); } static Image *ReadWBMPImage(const ImageInfo *image_info, ExceptionInfo *exception) { Image *image; int byte; MagickBooleanType status; ssize_t x; Quantum *q; ssize_t y; unsigned char bit; unsigned short header; /* Open image file. */ assert(image_info != (const ImageInfo *) NULL); assert(image_info->signature == MagickCoreSignature); if (image_info->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); image=AcquireImage(image_info,exception); status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception); if (status == MagickFalse) { image=DestroyImageList(image); return((Image *) NULL); } header=0; if (ReadBlob(image,2,(unsigned char *) &header) != 2) ThrowReaderException(CorruptImageError,"ImproperImageHeader"); if (header != 0) ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported"); /* Initialize image structure. */ if (WBMPReadInteger(image,&image->columns) == MagickFalse) ThrowReaderException(CorruptImageError,"CorruptWBMPimage"); if (WBMPReadInteger(image,&image->rows) == MagickFalse) ThrowReaderException(CorruptImageError,"CorruptWBMPimage"); if ((image->columns == 0) || (image->rows == 0)) ThrowReaderException(CorruptImageError,"ImproperImageHeader"); if (DiscardBlobBytes(image,image->offset) == MagickFalse) ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile", image->filename); if (image_info->ping != MagickFalse) { (void) CloseBlob(image); return(GetFirstImageInList(image)); } status=SetImageExtent(image,image->columns,image->rows,exception); if (status == MagickFalse) return(DestroyImageList(image)); (void) SetImageBackgroundColor(image,exception); if (AcquireImageColormap(image,2,exception) == MagickFalse) ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); /* Convert bi-level image to pixel packets. */ for (y=0; y < (ssize_t) image->rows; y++) { q=QueueAuthenticPixels(image,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) break; bit=0; byte=0; for (x=0; x < (ssize_t) image->columns; x++) { if (bit == 0) { byte=ReadBlobByte(image); if (byte == EOF) ThrowReaderException(CorruptImageError,"CorruptImage"); } SetPixelIndex(image,(byte & (0x01 << (7-bit))) ? 1 : 0,q); bit++; if (bit == 8) bit=0; q+=GetPixelChannels(image); } if (SyncAuthenticPixels(image,exception) == MagickFalse) break; status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y, image->rows); if (status == MagickFalse) break; } (void) SyncImage(image,exception); if (EOFBlob(image) != MagickFalse) ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile", image->filename); (void) CloseBlob(image); return(GetFirstImageInList(image)); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e g i s t e r W B M P I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % RegisterWBMPImage() adds attributes for the WBMP image format to % the list of supported formats. The attributes include the image format % tag, a method to read and/or write the format, whether the format % supports the saving of more than one frame to the same file or blob, % whether the format supports native in-memory I/O, and a brief % description of the format. % % The format of the RegisterWBMPImage method is: % % size_t RegisterWBMPImage(void) % */ ModuleExport size_t RegisterWBMPImage(void) { MagickInfo *entry; entry=AcquireMagickInfo("WBMP","WBMP","Wireless Bitmap (level 0) image"); entry->decoder=(DecodeImageHandler *) ReadWBMPImage; entry->encoder=(EncodeImageHandler *) WriteWBMPImage; entry->flags^=CoderAdjoinFlag; (void) RegisterMagickInfo(entry); return(MagickImageCoderSignature); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % U n r e g i s t e r W B M P I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % UnregisterWBMPImage() removes format registrations made by the % WBMP module from the list of supported formats. % % The format of the UnregisterWBMPImage method is: % % UnregisterWBMPImage(void) % */ ModuleExport void UnregisterWBMPImage(void) { (void) UnregisterMagickInfo("WBMP"); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % W r i t e W B M P I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % WriteWBMPImage() writes an image to a file in the Wireless Bitmap % (level 0) image format. % % WriteWBMPImage was contributed by Milan Votava . % % The format of the WriteWBMPImage method is: % % MagickBooleanType WriteWBMPImage(const ImageInfo *image_info, % Image *image,ExceptionInfo *exception) % % A description of each parameter follows. % % o image_info: the image info. % % o image: The image. % % o exception: return any errors or warnings in this structure. % */ static void WBMPWriteInteger(Image *image,const size_t value) { int bits, flag, n; ssize_t i; unsigned char buffer[5], octet; n=1; bits=28; flag=MagickFalse; for (i=4; i >= 0; i--) { octet=(unsigned char) ((value >> bits) & 0x7f); if ((flag == 0) && (octet != 0)) { flag=MagickTrue; n=i+1; } buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7); bits-=7; } (void) WriteBlob(image,(size_t) n,buffer+5-n); } static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info, Image *image,ExceptionInfo *exception) { MagickBooleanType status; const Quantum *p; ssize_t x; ssize_t y; unsigned char bit, byte; /* Open output image file. */ assert(image_info != (const ImageInfo *) NULL); assert(image_info->signature == MagickCoreSignature); assert(image != (Image *) NULL); assert(image->signature == MagickCoreSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception); if (status == MagickFalse) return(status); (void) TransformImageColorspace(image,sRGBColorspace,exception); /* Convert image to a bi-level image. */ (void) SetImageType(image,BilevelType,exception); (void) WriteBlobMSBShort(image,0); WBMPWriteInteger(image,image->columns); WBMPWriteInteger(image,image->rows); for (y=0; y < (ssize_t) image->rows; y++) { p=GetVirtualPixels(image,0,y,image->columns,1,exception); if (p == (const Quantum *) NULL) break; bit=0; byte=0; for (x=0; x < (ssize_t) image->columns; x++) { if (GetPixelLuma(image,p) >= (QuantumRange/2.0)) byte|=0x1 << (7-bit); bit++; if (bit == 8) { (void) WriteBlobByte(image,byte); bit=0; byte=0; } p+=GetPixelChannels(image); } if (bit != 0) (void) WriteBlobByte(image,byte); status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y, image->rows); if (status == MagickFalse) break; } (void) CloseBlob(image); return(MagickTrue); }